Thực hiện phép tính .

`a, \frac{1}{4} + \frac{-3}{8}`

`= \frac{2}{8} + \frac{-3}{8}`

`= \frac{-1}{8}`

`b,-0,32+0,98=0,66`

`c, \frac{13}{25} + \frac{6}{41} - \frac{38}{25} + \frac{35}{41} - \frac{1}{2}`

`= ( \frac{13}{25} - \frac{38}{25} ) + ( \frac{6}{41} + \frac{35}{41} ) - \frac{1}{2}`

`= \frac{-25}{25} + \frac{41}{41} - \frac{1}{2}`

`= -1+1- \frac{1}{2}`

`= \frac{-1}{2}`

`d, \frac{15}{34} + \frac{7}{21} + \frac{19}{34} - \frac{20}{15} + \frac{3}{7}`

`= ( \frac{15}{34} + \frac{19}{34} ) + ( \frac{1}{3} - \frac{4}{3} ) + \frac{3}{7}`

`= \frac{34}{34} + \frac{-3}{3} + \frac{3}{7}`

`= 1-1+ \frac{3}{7}`

`= \frac{3}{7}`

`e, 1 \frac{4}{5} + \frac{6}{29} - \frac{4}{5} - 0,3 + \frac{23}{29}`

`= ( 1 \frac{4}{5} - \frac{4}{5} ) + ( \frac{6}{29} + \frac{23}{29} ) - 0,3 `

`= 1 + \frac{29}{29} - 0,3`

`=1+1-0,3`

`=1,7`